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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '011c59a4c15679f8cd3768979bd093ee629715132905ae62a7bef07bcb18bcc6' 
  AND token = 'QNhXNC4miRnmTP8tfItKfhlqWYRFnduNZGg7lZENTPQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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