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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b76790067937578a3a02a1b5086dd70a89cc4bc34ab5cd0f60608d70d6a5888d' 
  AND token = 'TYAge1mDtyvttbdZJg51rGJaOuimaxvYlexUpz/vQFE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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