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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55697692eb571b9779f8d322552e5bda9413ddc3d360c9e5418d025f2959aef8' 
  AND token = 'Boz1o80eDa2lvBup6dOZT+vPQDNGqLbR6m2cgE3ZG74=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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