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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ab663ed03f9699900de2562c57eb8c9a56f04597987e3af62df945f00b2ebed' 
  AND token = 'ghGABA1jDl9UCr606318adrR2LZfQ/0YYsMIdzUa4e4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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