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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8e3f77a6740d5e8b8eeb1bf3886961ba9ac704a97918dc54065c6e16aeb4c34' 
  AND token = 'Ol8nHMGM1sGhcE/pmfbOpuAc4ybBdQrMSZHLS6gN4wo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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