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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9dc311351bc13810b0dd9fd832ed2532a7aec9976de9a4b8f39d7196054117ff' 
  AND token = 'LtVMRjSXr9DNMzk+te1dSid1rymR7QUbQ72FYSYSs0o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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