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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '727bfa80f8b29141fee383ef6efbf7c73e2ef62917f0b8488bc886f1558133f3' 
  AND token = 'YMAPIR/rkXbnQDLZwc9CLvLoIutnT7TvmD6WnoOQND8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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