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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89b547b9a61a69438b89e8180243ed86a15d09b111ca6ac1d1b65c1115e394eb' 
  AND token = 'Zweh7QZC1GD2SzgkixjazSo54VzqCWwAXXDfdc1FBQM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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