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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eabc6dc926ac7211dcc6166d0e108171a2908ab752fa92590cad5912fc74dd3a' 
  AND token = '5ElATBU+Yge9B7wnLhjUz92LtlgXZaSwUg9IkM1keZs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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