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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cabfc8742a0f1230ab3a73becbbfa47935a14c64883e8822929dbc445ae60232' 
  AND token = 'dvSOb0SO0v3Ro14+iFVFID/m7OWLVGwG92ehMGjeBdM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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