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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0789e832225942897532b5d23e5b6a19f8aaba3e12bb0b78a39287a8bd6e2ee1' 
  AND token = '7jbdycNAUDcFvlqkrrC0J/dVd+i7ICabCsy/j5K6iic=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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