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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7446cbf7ce03c8fbdb09502fbed68374a4deb510fa919e5364896c8b29175851' 
  AND token = 's52a4WrxO3RUaVQ2ULf3C6fNMu1rLPCy3DTi+797Ge4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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