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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c260c1f2500fca7eff4553fbad5e3a89e879e50c9e658e8388b67d9e8639a113' 
  AND token = '/t0aM97Vf0D1bXynwxeOaTVGFJUPESvYA215APIQ+hc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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