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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cdc7528ee1adf479bdab4293ec7181807f931e81e2c97be70f6bddba54dfc020' 
  AND token = '7XO+3N5UW3h1nz6+YbVPWrCPRuajydGKu2fIOduCi1o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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