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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '213b515a49298c168ab3731715e2e25013c8745923eb5c62139c73aa1cd0c13f' 
  AND token = 'WhGiBmSVQXc4eGyOOZPJM9MyWhk3JKrxsvDfeX14Mcs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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