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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '465f783b7986808d1f9e9f189e6c99462786882e0e20939b9049e795eb8d913e' 
  AND token = 'y8w26vWNHg0PXfA2qQ0CUihbAEALvVns6BIISQDFDUE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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