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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e426cf0d1adf5d2cf001d7308d6892eeca8eb1c8b1c5ce874c6d5bc0273433d' 
  AND token = 'L8GCiWobN8DaLtIYdQ1mRM3gUx3ELbEEPvUipvpSTLA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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