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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '214bd793d351ac191d3a6d10e8555a5c86a874edee7206c9ddefa5e4ca391c7f' 
  AND token = 'ZLUHYcmH5p1loTovpbL2Y/3JXjMLkPWsfqXc761cICQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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