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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '287ca3c73c11b1b98b4e4a9b3009559e9d8cf61f1b7c43a3ae89c0cd541992bf' 
  AND token = 'Qh4SFINp6y/HuERzHR/pmjDXZERobEaD9qu9HMsmkjI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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