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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62961cc942b363bb9b0047ac74b823e2fe11f6786894f8a51325a0442093ff96' 
  AND token = 'cfSdi5DF++SOTFFFg0+i6O3ESAW5Qa53vEldtzFOeBg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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