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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0671e02c00493bdf5db063a81432dd3ad1530bc3fc53e04ee263687c3a95a736' 
  AND token = 'J1XvQmgCaE+GJpgYf+sSn2oonX9GTMBNfF+8Vu+ozUQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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