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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09ed2c6b27e856aa2f192a272e11eeb05b46dce1129ee30d3cf6c93097cede14' 
  AND token = 'hAhBIRSyTvQNLWoero3aek/ZEsLyI1XLsdlQJ92vF3c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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