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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe5427fab10eec75b2a0a47a09dae18a25d5418e2a1ed815a6d60a637a1a9a7b' 
  AND token = 'QZRpn7Rns9rAejXMA22PXxqPKfmJgL82x2oBKd9CVoA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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