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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cffa7f64d95f474bebbb63dba72d3db85dc7dabb60c9643e5ba778b82c9cf9e4' 
  AND token = 'KTp5z/Zw63R8Zy8NMCwc7hIGdk4OjK3pCmEB2kimAbY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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