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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa864cafa1aae93ec0ef75942ddbc5fa5b55b7c548e971d957ab2d44dfb772d0' 
  AND token = '+RTtJnhr7nS6L45l1W9Pwbj4e/7g+eQlT7gxrsljd5E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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