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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7baad3a07770eb2e1bf4e93d2000bfe4bccef9b7614c3d71619739863aa063dd' 
  AND token = 'COJwuTlPDpaQMB/V7AboFA1Ol9T1t619fb8YjGrkmBA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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