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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7439c76ca4e6127b1c98b6237fadf7c9c7350cf13dde3575c054c86cd2b09e70' 
  AND token = 'E7fBbH+N2s4Uy/J/4BeDWhKtrYq73Q39qdcZkUCuz20=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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