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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ab3c64864dbfd06d06a9cecf3a83f953f58b410c83cffa5b5a852dbb0d8e624' 
  AND token = 'uMr7G1ni7ChgFr/QSJb4w/g4kdB73Goinf3xHb0yPXk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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