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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ebbf82a8ba65354c2e1f4b9e87cb82ec1396bf208e2983b9f4ad42b561bc96b6' 
  AND token = 'g4KTRMAgfzHwz0f+2EU0q1kQKCkbkdGhUh2/q4NtN8g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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