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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5634a164faf3ab810b3ea53c5ac4bb23568da9a2d0839baf8797ac5962bd39af' 
  AND token = 'XXy4KMz8n2hebOvykfuy7lUoX1SIGvM/fn3l0FwkDhc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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