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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea1a26b65c7319c5ae3026b385725258af9f6f30e34d3eb7131916d0d5583b79' 
  AND token = 'LeQQGAEiZtpixbvQnPSAgGWbQa72KbJRfxGTXZ5khbw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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