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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be1ab6cb8c66c9cfff33e2adc8296c92b98e7cb7f7ca7a0ddff7e7ff763cf187' 
  AND token = '0Z1W/YLRuzUuubcXtaTfoB6NO8QIZwYdoD4uyM9Lyh0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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