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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6bc73220158348ae68bf1e3d823142908e678ecf964ad4e116da6b60e0a7fb68' 
  AND token = 'K9rxeiQ+W2mQ1uB5+Gad4nD4hGmNmagconpZ4s/g33s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00064

JSON explain

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