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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e37a0e5800505e9c36cb7d2bc0999acb71d493b8f53adc2666232ef96718418' 
  AND token = 'PsBeEJIrOWlmll+67TXYcXE3fzwES38gufXf0f3sBas=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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