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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff198e891033159de7371159ae4a89716e856e282fef2cdef64e9775427131c8' 
  AND token = 'kZI9yiSZZ/fD5aMI87V79SRpGAEdJWDuEEeT37ffoj4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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