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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'abe5f471f7ac5c3b75841f318791d237a8eb3cbac0d659f0e9ca70d03c4c4562' 
  AND token = 'XfLW+p/WRK5P+MU3xn2YWauvJBaJV28PI8I8N/48oxk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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