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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f2f6d43ebb0e420cc1302723f48434f717a2fdf9dc90869ac0b8b69748221d3' 
  AND token = 'jFRS7WeAIEswmER9Oowg/kpFwBk+Fuue6vjEqm1CR6E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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