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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '565f4d2e577119f750f26da670d983247e78fcaf16285a4dbe7ec1309c6eaabd' 
  AND token = 'BRCN2op18yv965LRG72lLiw7dq8A5ZuEsvxAADbaNEM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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