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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c87b9850c2299f0ffff805b5e721d7bcdee89fbf44becafb6a91b9db88fd1b9' 
  AND token = 'oiTxpo4iMT2YyxpHjzim54jMySf3EE/goWmas1Q3GGg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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