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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63946b24ef29dbf4637726ffd8f99cab411ee9520e5286a6e88c708bb1c0b537' 
  AND token = '9N+K50aw4yAC5cyOGBl91y5umLzm0GsaY/r8VHw06T8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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