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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8cefdbee5395797de73e92497da2aa8f3251cc1e7dc9febf9735d618eb37083' 
  AND token = '7Nz4azMbVE3Y79Os0wxXG+rPvEUVZfyt4Z5UL05QSeI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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