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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5bbc160e909037bd9fd03aa2d7ffbd34bc59f628b54bfa2d64abbbe7a2476b1b' 
  AND token = 'V3yXU0Qhraz7tY95sJdXk0DwqeFP2Zxih1n36n/uxBM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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