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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9350a0c51c6c02a86325ab70f382f09384fe0d4c89536892ab04a7e97eac74b6' 
  AND token = 'JLh2xBiHA25HUTA2vOoQ14AsEjbU5NuI5EPrDorgCcY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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