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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e34abe6b11a61a1132265479d0719cb589dbf2322cbf549a6098b7f14c2fc75' 
  AND token = '7B8GlFUesfFdWh8vJnkDM/d0jJGny6F1SM7zsVDDf7I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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