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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3e38a119330476e70297b9ecb3ad7f9715ea5e6ba4f9eb24c21db6b921de444' 
  AND token = 'mQQyutBJ4anK/bVa0C43cBLffuqH18grp+xx4/FxDXo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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