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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13c750ae33072e56bef66eb413c55aeb1a5efa6f8f3bb4191dee2845253ec630' 
  AND token = 'oexwyoCjX0qhCgvBEFXv+KMweHAJkflqx7XPEIlRg8Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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