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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c111dab890c90428fca0db92fa2ad659eb40c03f0ca0ff6c886e4a71bacd78c1' 
  AND token = 'wszzdZlJgEBRPUNwdnxfzAPO7TPLNNINjnsLb+WYKtI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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