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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6efd46edea3fa6da84f6910ef8d0f3bf1119c25febaa83826515a1d4f19aaa6' 
  AND token = 'zVxk8Hxy4vdGWiDpUadSMMgExNVVq72mJciX2/cyPLo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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