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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6bc52023868908d6c2d90a4990c899c3e14f154b1fcd638218eaebcd607bb43f' 
  AND token = 'MByxlUZ8BeVsv9v6n6ZHGt7NL24GdmOziB6njaNzBIQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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