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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8bcd2b90735dda42cca468dd991ae8da4f04ddb791c50dbbdb2f671eb0b663f' 
  AND token = 'WSWMyEIoA0OcXr2aTcJCYJt2WEk1EufZfZORprnjx3E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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