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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92b802bec919b82686f8dc6c4ec3a9a8c1dc2c0b7e0b223a9cd6a5c38d58c07d' 
  AND token = 'r1tDrpYvUameAPiE81/48YDwijfT0rGMsYvqePbGV/E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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