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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb98eab940fc5d03a3bb209ae6acd04925c497f2a69910d31e44949c68132e53' 
  AND token = 'LwJUODro7B3KHUrHqsJwc1GqSAOL9SWyBML/jKdXgK8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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