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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e4c59c2d1f202bcd3966d3ff02e126a1e011398073aade709f4aa5b248dc3655' 
  AND token = 'FONDdZ0A5yWeWeYvM6TM60ZcY/jIsTyj+QvI+d1xFmA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00081

JSON explain

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