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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bfa5ce2e11b16695d821ac034744fe93bfb1c425f65367a2420f8741998e4618' 
  AND token = 'ekA21G8Mu2R1JRrkHBcC5qfyRmppc3C2Vj9a7cqcDUs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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