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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b8950979bd206f5eeb35ede0a46ded6bacf8def41a3104d5a64b6b2ff4c4fc8' 
  AND token = 'KEXyFOP4+xRIPrXF2ljfFvf+hyZq08ZYN8+8erhCvws=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00154

JSON explain

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