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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62f3a3d241cf87aa23d1b5515a7e73e3428e4725392d3fcffffa805a4beaa7a8' 
  AND token = 'k0mWLBUogesTgRHPFcDK9h943/fzfkveSGhmbJUw2jo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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