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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '007e5fcd210d074fccb1288ef5723c9718e7269a63f7eb892ceb0c0ec7fe30d5' 
  AND token = 'fKCCGehXUIwIuUBAK2jPBJTBu1i4/USiml4wWWUuiX4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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