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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '332ba9462277e4c6cebd6cc51590eff0bfc593d39b6e082e2c686248b6fecd8a' 
  AND token = 'yY/GFauZAYYC5wYzp+GNFm34WK8uum6EEoxhNEwv9/c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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