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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '50e0c2b692639b978b068f6d7b12b6aaafb21ae84cb04fadde23cb0cc033d09f' 
  AND token = 'EHrSKCSvC2TdAcyogs6n1WK/wjrdpXy1DlIX1svVo1s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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