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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fbc1cafdcbec83093d4f35fb6820f518af62dd517c29a0057a11bd29a42a870c' 
  AND token = 'rZxHH4dbdIn2BFR/C9h57qLG+4kac/aojBCyqK8NDfo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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