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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5c420cd707e629a19ab898d5e553754e85ffa1798beb711eaf70366139cd577' 
  AND token = '99V9hkQD3zia75xOEzLY4wJvQhFGg1EEVBsy69GsVTE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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