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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f19db66cb0e4adea03a59aaaaf3e835b7930a061f5024a43b3ad38fe816b8d4' 
  AND token = 'FcQFC1XMpbjC2B+cJkmWyoA54NxfrXWLQpdCVB20Oqc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}