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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9c0cefb49365edce91045ab144be3502482057a98779b7ef0cf3d11fbec4beb' 
  AND token = '2iNvocKCblie1glnCrqNPG4628De5GUCQk/J8ucd2mg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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