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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b44ad5e7fbeace0d048b5428b7a44a0528e88a9352aa55b2a9cf1d3386e59f39' 
  AND token = 'Q/oarav0dFHsSkPc/FmaJykQtYPwXPVJDPQVvl1x3Hw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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