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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f36fcf80237aae032a05d46b74ab3fcee8799cc8c85e725721dec2c5480c2071' 
  AND token = 'S34om+//kbBncFNS2qoztQhTxciDrrbE8bEJZeOZYyc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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