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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dada4da97441a2b8e7a0216d788b7ddfbea0a1fcda1cf105b468763b198687fc' 
  AND token = '1rT4tkgis1MXXsC8gwCXQaZb7qpqOEvwcgSZGIStNFg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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